Building Background:
What are the basic needs of an organism?
organisms need water, food, and oxygen
How do we meet our basic needs?
We drink water, eat food, and breathe oxygen
What is a membrane?
A membrane is a structure that keeps good things in and bad things out. It is part of a cell and protects us.
ASK: We read "Juan Daniel's futbol Frog" in order to learn about the rain forest habitat of El Salvador and how one child fixes a big frog problem....
Why is it important to keep the frog's skin moist?
It is important to keep the frog's skin moist because it meets it's basic needs through it. It absorbs water and oxygen through it's skin. The moist skin is like the frog's membrane. If the frog's skin isn't moist, it can't survive.
How can we keep a frog's membrane moist if it is not in a rain forest habitat?
How do bio engineers use natural objects to inspire man-made technologies?
Bio engineers use natural objects to inspire man-made technologies by looking into natural habitats, looking at the different parts of the animal e.g. a bird's wing inspired the wing of a plane, the duck's feet inspired swim fins,and the exoskeleton of a crayfish inspired armor.
By Genevieve
What are some properties of natural membranes and what materials might be good choices for designing a model membrane?
Soft, filter system, something spongy, holes.
Experiment: "Raisin Skin"
We explored raisin membranes.
Prior to experiment:
1. Label 4 cups "1", "2", "3", "4"
2. Put 3 dry raisins in cup 1
3. Put 3 dry raisins, 1/2 cup of water in a cup for 24 hrs
4. Put 3 dry raisins, 1/2 cup water and a tablespoon of sand in cup for 24 hrs.
5. Put 3 dry raisins, 1/2 cup water in cup for 3 hrs
During experiment:
What did we observe about each type of raisin?
"1"
How long was the raisin in water?No time.
Do you see holes? no
What are the properties?no holes, craters, wrinkly, reddish brown, smells sweet, rough
"2"
How long was the raisin in water?24 hrs.
Do you see holes? no
What are the properties? inflated, round, plump, squishy, smells sweet, light brown, little wrinkly
"3"
How long was the raisin in water?24 hrs. with sand
Do you see holes? yes
What are the properties? decomposed, puffed up, turn gray, mushy, grooves
"4"
How long was the raisin in water?3 hrs
Do you see holes? no
What are the properties? wet, yellow brown, little puffed, smell sour
By Sydney
What are the basic needs of an organism?
organisms need water, food, and oxygen
How do we meet our basic needs?
We drink water, eat food, and breathe oxygen
What is a membrane?
A membrane is a structure that keeps good things in and bad things out. It is part of a cell and protects us.
ASK: We read "Juan Daniel's futbol Frog" in order to learn about the rain forest habitat of El Salvador and how one child fixes a big frog problem....
Why is it important to keep the frog's skin moist?
It is important to keep the frog's skin moist because it meets it's basic needs through it. It absorbs water and oxygen through it's skin. The moist skin is like the frog's membrane. If the frog's skin isn't moist, it can't survive.
How can we keep a frog's membrane moist if it is not in a rain forest habitat?
How do bio engineers use natural objects to inspire man-made technologies?
Bio engineers use natural objects to inspire man-made technologies by looking into natural habitats, looking at the different parts of the animal e.g. a bird's wing inspired the wing of a plane, the duck's feet inspired swim fins,and the exoskeleton of a crayfish inspired armor.
By Genevieve
What are some properties of natural membranes and what materials might be good choices for designing a model membrane?
Soft, filter system, something spongy, holes.
Experiment: "Raisin Skin"
We explored raisin membranes.
Prior to experiment:
1. Label 4 cups "1", "2", "3", "4"
2. Put 3 dry raisins in cup 1
3. Put 3 dry raisins, 1/2 cup of water in a cup for 24 hrs
4. Put 3 dry raisins, 1/2 cup water and a tablespoon of sand in cup for 24 hrs.
5. Put 3 dry raisins, 1/2 cup water in cup for 3 hrs
During experiment:
What did we observe about each type of raisin?
"1"
How long was the raisin in water?No time.
Do you see holes? no
What are the properties?no holes, craters, wrinkly, reddish brown, smells sweet, rough
"2"
How long was the raisin in water?24 hrs.
Do you see holes? no
What are the properties? inflated, round, plump, squishy, smells sweet, light brown, little wrinkly
"3"
How long was the raisin in water?24 hrs. with sand
Do you see holes? yes
What are the properties? decomposed, puffed up, turn gray, mushy, grooves
"4"
How long was the raisin in water?3 hrs
Do you see holes? no
What are the properties? wet, yellow brown, little puffed, smell sour
By Sydney